Conclusions Wide-angle lenses are often on the large side, and it's rare that you see one with an f/1.4 aperture. But the Sigma 20mm F1.4 DG HSM Art is a special lens indeed. Not only does it capture a lot of light, it also manages to focus close, shoot images with excellent detail, and minimize...

Sharp from edge to edge; Minimal distortion; Short minimum focus distance; Available for multiple systems

Heavy; Dim corners and edges; No support for filters

The lens has good contrast and is sharp as a razor. Good in low light. AF is good, the same as the 35mm 1.4 art. Hoping they can come up with a way to put a filter on it. Would like to use my neutral density with this.

Great Picture Quality

Heavy

Call them what you will – ultra-wides or super-wides – I love ‘em. By covering a breathtaking expanse, these types of extreme wide-angle lenses are not only capable of capturing most landscapes, they also help sweep you into that landscape, making you feel a part of the scene in the process.

Previously not available in focal lengths wider than 24mm, the ultra-wide f/1.4 aperture is now available in the 20mm focal length thanks to Sigma, allowing a wider angle of view to be captured in very low light conditions.

At last, a super-wide lens that's sharp and quick! Combining this lens with ISO 6400 on the Canon 5d Mark III and the noise reduction of Lightroom, I am impressed at the scenarios I can shoot hand-held with virtually no light. Candlelight just No issue.

sharp and great colors

no cons

The Sigma 20mm F1.4 DG HSM is a very fast, tack-sharp prime lens in Sigma's excellent Art series, and also a unique lens to boot, as it's the only 20mm lens in the World to offer an f/1.4 aperture.

Sigma's latest offering in the Art Lens portfolio is an ultra-wide 20mm full frame lens, for Nikon, Canon and Sigma fit. Not only that, but an extra-bright f/1.4 aperture makes this a desirable optic from the start. All looking good in theory, now let's see how it handled and performed in practice.

Superb optical quality; Well made; High control of CA; Excellent handling; Excellent AF performance

Price penalty for f/1.4 aperture; Heavy and bulky; Not weather resistant

For the past couple of months, I've been incredibly busy testing gear from many different manufacturers. But as many of you know who have been readers of this blog for a while, I switched all my DSLR lenses over to Sigma a couple of years back. Why